DaveC wrote:
Thanks, Russ, for your observations.


If you are OK with linear polarization (is the antenna for WiFi use?),
I suspect a biquad would provide better illumination than a cantenna
or a patch. Not that the latter two wouldn't work, it's just they
aren't optimum for that f/D


Yes, WiFi. If need be, can't I just rotate the biquad feed by 90 deg. and get
horiz. polarization?

Yeah, I see (via net search) that biquad fits nicely with a 0.7 f/D dish.

Thanks again,

Yes. Just turn the biquad so the one quad is 'on top' of the lower quad
and you will have horizonal polarization. The pattern looks pretty
symmetrical in both the E and H planes

Best of luck